Development of Geogebra-assisted student worksheet for transformational geometry learning

This study aims to develop Student Worksheets assisted by Geogebra software to be used in Geometry Transformation lectures. This research is a development research to develop Geogebra assisted Student Worksheet for Transformational Geometry learning. This development research refers to the Jan van den Akker model, namely: 1) Preliminary investigation, 2) Theoretical embedding, 3) Empirical testing, and 4) Process and results of documentation, analysis and reflection. The instruments in this study are the Observation Sheet and Tests. The results of this study are a set of Student Worksheets that can be used in Transformational Geometry learning. The Student Worksheets contain several student activities using Geogebra software to improve student problem solving skills. In general, developed Student Worksheets are of good quality. The aspect of practicality of Student Worksheets meets very good criteria based on student responses, namely with a score of 3.33 from the maximum score 4. Judging from the aspect of effectiveness, Student Worksheets meet good criteria based on the results of student problem solving ability tests, which score is 2.34 from the score maximum 4. The constraints faced in developing and implementing Geogebra-assisted worksheet are that students are still not fluent using Geogebra software and are still having difficulty interpreting Geogebra's appearance and output.